Remove Akamai from LICENCE

Previously, clauses were added to the licence to allow John Chittum
(@j5awry) to contribute to the project whilst working at Akamai.
During this time, he made no copyrightable code commit and as of
Jan 17th 2020 he will no longer be working for Akamai. As such,
there is no need for Flask-RESTX to continue with the licence
additions.

Author: SteadBytes

CONTRIBUTING.rst

@@ -110,10 +110,11 @@ If you're new to NPM, also check out `nvm <https://github.com/creationix/nvm/blo
 Updating Copyright
 ------------------
 
-If you're a part of a corporation with an NDA, you may be required to update the LICENSE.
+If you're a part of a corporation with an NDA, you may be required to update the
+LICENSE file. This should be discussed and agreed upon by the project maintainers.
 
 1. Check with your legal department first.
-2. Add an appropriate line to the LICENSE file. See the Akamai entry for an example
+2. Add an appropriate line to the LICENSE file.
 3. When making a commit, add the specific copyright notice.
 
 Double check with your legal department about their regulations. Not all changes

LICENSE

@@ -2,7 +2,6 @@ BSD 3-Clause License
 
 Original work Copyright (c) 2013 Twilio, Inc
 Modified work Copyright (c) 2014 Axel Haustant
-Addition contributions Copyright (c) 2019 Akamai Technologies
 
 All rights reserved.